Inside door lock



1966 'H. BERGER 3,265,423

INS IDE DOOR LOCK Filed Dec. 4, 1964 [wen/0): Berger 1 United StatesPatent 3,265,423 INSIDE'DOOR LOCK Hans Berger, 17647 Belinda St.,Encino, Calif. FiledDec. 4, 1964, Ser. No. 416,095 7 Claims. (Cl.292-6'7) This application is a continuation-in-part of my applicationSerialNo. 364,428 filed May 4, 1964.

This'invention relates to a door lock for use on the inside of a door,to'provide security and safety for the occupants of a'house or room.

Almost all locks, latches and fastening devices which are -'now in useon the-inside of a door have the'disadvantage that they can beforcedopen or torn loose through the application of extreme force to thedoor from the outside.

It is the primary object of my invention to provide an inside 'door lockwhich is so constructed that it is impossible for it tobe opened or tornloose, regardless of how much'force is applied to'the outside of thedoor.

Another object ofmy invention is to provide a lock of the' typedescribed which can be mounted on any door or door jamb withoutrequiring any alterationin the door structure other than possiblymortising the lock t parts slightly into the side of the door and/ ordoor jamb, whereever this is required.

A further object of my invention is 'to'provide a lock of the classdescribed which isextremely simple and economical to manufacture, sothat it can-be sold at a relatively low price for widespreaddistribution and sale. In

particular, two of the principal parts forming my lock are substantiallyidentical with each other, so that they can be formed from a singleblank.

Still another object of the invention isto provide an inside'securitydoor lock which can be mounted-on either a left or righthandopeningdoor.

- Another object of my invention is to'provide a lock of the'typedescribed in which an auxiliary latch operable only from the inside actsto hold the latch member in place and prevent it from being opened fromthe outside by the insertion of a burglary tool between the door anddoor jamb.

In essence, my invention contemplates an inside door lock which includesa pair of side plates, one of which is adapted to be mounted on theinside edge of the door and the other of which is adapted to be mountedin a corresponding position on theside edge of the door jamb.

Each of the side plates is provided with a portion which protrudesinwardly into the room. The protruding portion of each side plate-isprovided with a substantiallyvertically directed slot.

A latch member is preferably pivotally mounted on one of the side platesso that it may be pivoted between open and closed positions and'besecurely held in each such position by the forceof gravity. When thelatch member is disposed in its closed position, it'has a portion whichfits within the slots to prevent the movement of either side plate withrespect to the other, thus preventing the door from being opened.

The fastening members which secure the side plates to the door and 'doorjamb are preferably directed transversely to thedoor and door jamb, sothat they cannot possibly be pulled out when the door is closed,regardless of the amount of force which is applied to the outside of thedoor.

My invention also comprises such other objects, advantages andcapabilities as will later more fully appear and which are inherentlypossessed by'my invention.

-While I have shown in the'accompanying drawings. preferred embodimentsof my invention, it should be understood that the same are susceptibleof modification and Patented August 9, 1966 latch also inclosed-position, the door jamb-being disposed on the opposite side fromFIG. 1 and 'the lock being modified accordingly;

FIG. 3 is a top plan view of the structure shown in FIG. 1, with thedoor, lock and auxiliary latch-in closed position;

FIG. 4 is a'sectional-view'taken along line 4-4 of FIG.

. 3, showing the auxiliarylat'ch assembly.

A preferred "embodiment which has beenselected to illustratexmyinvention comprises a side plate having an inner portion 11, which'isadapted to be mounted in overlying relationship to-the side edge of.a'door jamb. A fastening member such as a'screw 13 extends through anopening in the center of the'inner. portion 11 into the door jamb.Theporti'on of 'the'face of the side plate "10 immediately surroundingthe screw iopening may be counter-sunk so that the head ofthe screw 13is flush with the face of the side plate 10.

The outer portion 17 of the side plate protrudes toward the inside ofthe room. It carries a vertically directed straight slot 15, whichextends downwardly from its top edge. The side plate 10 may be mortisedas shown in the drawings, or mortising inay be omitted if there issufficient clearance between the doorand door jamb to accommodate theside plates.

A second side plate l8 is formed in'substantially the same manner as theside plate 10. It includes an inner portion 19, which overlies the sideedge ofthe-door in a position corresponding to and aligned with theinner portion 11 of the side plate 10. A screw 21 extends into thedoor.- The side plate 18 may be mortised as shown,

or the mortising may be omitted if it. is unnecessary. The

outer portion 22 of the side plate 18 carries. a vertically directedstraight slot 23 which corresponds .to and is aligned with thecorresponding slot 15 of the side plate 10.

A latch member 26 is mounted on the outer portion 22 or the outerpoltion17 by means'of a rivet-27, which is mounted in an opening 32. The'latchmember 26 comprises a pair of sides-"28 and'29, which extendsubstantially parallel to the side plates 10 and 18 when the latchmember 26 is in closed position. The sides28 and 29 are'joined by anintegral flatcatch 31.

Each of the sides 28 and 29 of the latch member 26 is provided with-anelongated slot'24, which is adapted to fit around the rivet27. The rivet27 may be mounted on either side 28 M29 for use of the lock on either aleft or right hand door. Thelatch member 26-is accordingly free torotate on the rivet 27 and is also capable of limited vertical movementwith respect to the side plate upon which it is mounted.

The latch member26 is movable between two positions, both over centerwit-h respect to the pivot point (rivet'27), so that gravity tends toretain the latch member 26 in position.

FIG. 1 of the drawings shows'the latch member 26 in its retracted oropen position, in which the latch member is suspended beneath the sideplate 18.

FIGS. 2-4 of the drawings show the latch member. 26 in its closed orlocked position,.in which the 'catch 3l' is directed vertically and isdisposed within the aligned slots Y15 and 23 of the. side plates.10.an'd18. The latchme'mber 26 is rotated clockwise from the position shownin FIG. 1 to a position wherein the catch 31 is disposed above the slotsand 23 in the side plates. then permits the latch member 26 to movevertically downwardly so that the catch 31 is disposed within the slots15 and 23, as shown in FIGS. 2-4 of the drawings.

It will be noted that when the latch member 26 is in locked position andthe catch 31 is disposed within the slots 15 and 23, it is impossiblefor either of the side plates 10 and 18 to be moved with respect to theother and it is accordingly impossible for the door to be opened. It thedoor is moved toward open position, the catch 31 engages the edge of thestationary slot 15, to prevent further opening movement of the door.

It will also be noted that the screws 13 and 21 are directedtransversely to the side plates 10 and 18 and are so disposed that theycannot be pulled out by the exertion of force upon the door, becausethere is insufficient space between the door and door jamb to permitthem to be pulled out.

The latch member 26 should always be mounted on the door rather than thedoor jamb. My lock may be changed for use on a left hand or right handopening door by merely changing the latch member 26 from one side plateto the other. All of the parts remain the same.

It should be. noted that when the latch member 25 is in closed position,the sides 28 and 29 enclose and are disposed in close parallelrelationship to the outer portions 17 and 22 of the side plates 10 and18. They thus act to prevent any lateral movement or separation of theouter portions 17 and 22 in a direction away from each other which mightresult in permitting the door to be opened.

In order to prevent the latch member 26 from being released by theinsertion of a thin burglary tool between the door and door jamb fromthe outside, I provide an auxiliary latch 33. The auxiliary latch 33 hasadjacent its midportion a short eldngated slot 34 which fits around therivet 27 to mount the auxiliary latch 33 for pivotal movement and alsofor limited vertical movement.

The upper end of the latch 33 is provided with a hook 35, which isadapted to fit around a pin 36, which is provided on each side 28 and 29of the latch member 26. The slot 34 permits the necessary limitedvertical movement when the hook 35 is moved to and from engagement withthe pin 36.

The auxiliary latch 33 may, of course, be omitted without affecting theoperation of the remainder of the device. It may also be left open bythe user, if desired.

The outer portions 17 and 22 of the side plates 10 and 18 and the sides28 and 29 of the latch member 26 may be provided with openings which arealigned when the latch member 26 is in locked position. Such openingsmay accommodate a padlock, bolt or other locking means to hold the latchmember 26 in closed position.

I claim:

1. An inside door lock comprising a pair of side plates adapted to bemounted in corresponding positions on the side edges of a door and doorjamb, each of said side plates having an inner portion secured inoverlying relationship to the door or door jamb by a fastening memberwhich extends transversely to said side plate and door or door jamb,each of said side plates having an outer portion protruding from thedoor or door jamb, the outer portion of each of said side plates havinga vertically.

directed straight slot, said slots being aligned with each other whenthe door is closed, a latch member slidably and pivotally mounted on theouter portion of the side plate carried by the door, said latch memberhaving a straight catch adapted to fit within said slots, said latchmember being movable between open and closed positions, said catch insaid open position being out of engagement with said slots, said catchin said closed position being disposed within said slots to prevent themovement of said side plates with respect to each other and prevent theopening of the door, the side plate carried by said door having a pivotpin, said latch member having an elongated The slot 24 slot, said pivotpin extending through said slot, whereby said latch member may berotated around said pivot pin and may also be moved vertically to alimited degree before or after such rotational movement, in order topermit the movement of said catch in a straight vertical direction inand out of said straight slots.

2. The structure described in claim 1, said latch member having a pairof sides which fit around and extend substantially parallel to the outerportions of said side plates when said latch member is in closedposition, said catch extending transversely between and being formedintegrally with said sides.

3. The structure described in claim 1, and an auxiliary latch rotatablymounted on said pivot pin, a pin carried by said latch member, saidauxiliary latch being adapted to engage with said pin to hold said latchmember in closed position.

4. The structure described in claim 3, said auxiliary latch having anelongated slot disposed around said pivot pin, whereby said auxiliarylatch may be moved vertically to a limited degree for engagement anddisengagement of said auxiliary latch with said pin.

5. An inside door lock comprising a pair of side plates adapted to bemounted in corresponding positions in the side edges of a door and doorjamb, each of said side plates having an inner portion secured inoverlying relationship to the door or door jamb by a fastening memberwhich extends transversely to said side plate and door or door jamb,each of said side plates having an outer portion protruding from thedoor or door jamb, the outer portion of each of said side plates havinga slot, said slots being aligned with each other when the door isclosed, a latch member slidably and pivotally mounted on the outerportion of the side plate carried by the door, said latch member havinga catch adapted to fit within said slots, said latch member beingmovable between open and closed positions, said catch in said openposition being out of engagement with said slots, said catch in saidclosed position being disposed within said slots to prevent the movementof said side plates with respect to each other and prevent the openingof the door, and an auxiliary latch rotatably mounted on the same pivotmeans as said latch member, a pin carried by said latch member, saidauxiliary latch being adapted upon rotation thereof to engage said pinto hold said latch member in closed position.

6. An inside door lock comprising a pair of side plates adapted to bemounted in corresponding positions on the side edges of a door and doorjamb, each of said side plates having an inner portion secured inoverlying relationship to the door or door jamb by a fastening memberwhich extends transversely to said side plate and door or door jamb,each of said side plates having an outer portion protruding from thedoor or door jamb, the outer portion of each of said side plates havinga vertically directed straight slot, said slots being aligned with eachother when the door is closed, a latch member pivotally mounted on theouter portion of the side plate carried by the door, said latch memberhaving a straight catch adapted to fit within said slots, said latchmember being movable between open and closed positions, said catch insaid open. position being out of engagement with said slots, said catchin said closed position being disposed within said slots to prevent themovement of said side plates with respect to each other and prevent theopening of the door, said latch member having a pair of sides which fitaround and extend substantially parallel to the outer portions of saidside plates when said latch member is in closed position, said catchextending transversely between said sides, the side plate carried bysaid door having a pivot pin, each side of said latch member having anelongated slot, said pivot pin extending through one of said slots,whereby said latch member may be rotated around said pivot pin and mayalso move vertically to a limited degree to permit the movement of saidcatch in and out of said slots.

7. The structure described in claim 6, and an auxiliary latch rotatablymounted on said pivot pin, a pin carried by each side of said latchmember, said auxiliary latch upon rotation thereof being adapted toengage one of said pins to hold said latch member in closed position.

References Cited by the Examiner UNITED STATES PATENTS 447,664 3/1891Clark 292286 949,405 2/1910 Smith 292-136 974,566 11/ 1910 Giles 2921366 Shepard 292202 Bell 292286 Youngblood 292-299 X Ferris 292304 XFOREIGN PATENTS Great Britain. Italy.

10 PATRICK A. CLIFFORD, Primary Examiner.

RICHARD E. MOORE, Examiner.

1. AN INSIDE DOOR LOCK COMPRISING A PAIR OF SIDE PLATES ADAPTED TO BEMOUNTED IN CORRESPONDING POSITIONS ON THE SIDE EDGES OF A DOOR AND DORJAMB, EACH OF SAID SIDE PLATES HAVING AN INNER PORTION SECURED INOVERLYING RELATIONSHIP TO THE DOOR OF DOOR JAMB BY A FASTENING MEMBERWHICH EXTENDS TRANSVERSLY TO SAID SIDE PLATE AND DOOR OR DOOR JAMB, EACHOF SAID SIDE PLATES HAVING AN OUTER PORTION PROTRUDING FROM THE DOOR ORDOOR JAMB, THE OUTER PORTION OF EACH OF SAID SIDE PLATES HAVING AVERTICALLY DIRECTED STRAIGHT SLOT, SAID SLOTS BEING ALIGNED WITH EACHOTHER WHEN THE DOOR IS CLOSED, A LATCH MEMBER SLIDABLY AND PIVOTALLYMOUNTED ON THE OUTER PORTION OF THE SIDE PLATE CARRIER BY THE DOOR, SAIDLATCH MEMBER HAVING A STRIAGHT CATCH ADAPTED TO FIT WITHIN SAID SLOTS,SAID LATCH MEMBER BEING MOVABLE BETWEEN OPEN AND CLOSED POSITIONS, SAIDCATCH IN SAID OPEN POSITION BEING OUT OF ENGAGEMENT WITH SAID SLOTS,SAID CATCH IN SAID CLOSED POSITION BEING DISPOSED WITHIN SAID SLOTS TOPREVENT THE MOVEMENT OF SAID